Features and BenefitsIdeal for use in corridors, entrances and stairwaysAutomatically closes doors � an alternative to overhead mounted door closersLifetime warranty against defects in material and workmanshipPatented ratchet adjustment eliminates need for adjustment locking pinConforms to ANSI/BHMA Standard A156.17* Meets NFPA80 Standard for 3 hour fire rated doors � minimum 2 spring hinges Per door requiredUK fire approval for use on FD30 and FD60 doorsUse anti-friction hinges with spring hinges for best spring performance* UL listed for doors up to 4"x8" weighing up to 180 lbs.* Pivot point designed to align with CB and FBB series anti-friction bearing hinges* Carded product packaged with hex wrench* Ratchet design allows for quick fine tuning tension up or down with allen hex key* Bulk open (BO) packaging available for production pre hangers